Reduced Order Estimation of the Speckle Electric Field History for Space-based Coronagraphs

Leonid Pogorelyuk, N. Jeremy Kasdin, Clarence Worth Rowley

Research output: Contribution to journalArticle

Abstract

In high-contrast space-based coronagraphs, one of the main limiting factors for imaging the dimmest exoplanets is the time-varying nature of the residual starlight (speckles). Modern methods try to differentiate between the intensities of starlight and other sources, but none incorporate models of space-based systems that can take into account actuations of the deformable mirrors (DMs). Instead, we propose formulating the estimation problem in terms of the electric field while allowing for dithering of the DMs. Our reduced-order approach is similar to intensity-based PCA (e.g., KLIP) although, under certain assumptions, it requires a considerably lower number of modes of the electric field. We illustrate this by a FALCO simulation of the Wide-field Infra-red Survey Telescope hybrid Lyot coronagraph (the data and the comparison code are available at https://github.com/leonidprinceton/EFOR).

Original languageEnglish (US)
Article number126
JournalAstrophysical Journal
Volume881
Issue number2
DOIs
StatePublished - Aug 20 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • methods: data analysis
  • methods: statistical
  • techniques: high angular resolution
  • techniques: image processing

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